diff --git a/Firestore/Example/Tests/Integration/API/FIRServerTimestampTests.mm b/Firestore/Example/Tests/Integration/API/FIRServerTimestampTests.mm
index 860c8aac9ee..ba5fa55a2db 100644
--- a/Firestore/Example/Tests/Integration/API/FIRServerTimestampTests.mm
+++ b/Firestore/Example/Tests/Integration/API/FIRServerTimestampTests.mm
@@ -220,7 +220,8 @@ - (void)testServerTimestampsWithConsecutiveUpdates {
                              serverTimestampBehavior:FIRServerTimestampBehaviorPrevious],
                         @42);
 
-  [_docRef updateData:@{@"a" : [FIRFieldValue fieldValueForServerTimestamp]}];
+  // include b=1 to ensure there's a change resulting in a new snapshot.
+  [_docRef updateData:@{@"a" : [FIRFieldValue fieldValueForServerTimestamp], @"b" : @1}];
   localSnapshot = [_accumulator awaitLocalEvent];
   XCTAssertEqualObjects([localSnapshot valueForField:@"a"
                              serverTimestampBehavior:FIRServerTimestampBehaviorPrevious],